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Non - Destructive Testing is the Technology of assessing the Soundness and Acceptability of an actual component without affecting the functional properties of the component. |
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Non Destructive Testing Technique is the Technology in general. |
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Non Destructive Inspection is use of the Technology for inspecting materials to known standards. |
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Non Destructive Evaluation is the art of developing NDT Techniques, Arrivingat acceptance standard for components for which nothing is available to start with. |
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Non - Distructive Testing Services ( NDT Services ) |
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In simple words it is, TESTING A COMPONENT WITHOUT DESTRUCTION. by Definition NDT is the testing of materials, for surface or internal flaws or metallurgical conditions without interfering the integrity of the material or its suitability to future service. |
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| Importance of NDT |
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The importance of NDT methods is reflected in preventing major failures and damages by early identification and detection of critical discontinuities in Raw material, during subsequnt processing and in service. This is similar to medical check up so as to prevent forthcoming diseases. |
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| Role of NDT |
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Development and Improvement Of Material and Process for Fabrication. |
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Determining quantitative influence of flaws and properly variables. |
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Determining critical (weak) Spots in manufacturing operations. |
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Establishing and Measuring quality and acceptance limits. |
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In service Inspection. |
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Failure Analysis. |
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| Source of Defects |
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Manufacturing Operation |
Product OR Process |
Possible Defects Produced |
Foundry |
Cast Ingots |
Center line pipe, Inclusion voids, Porosity. |
Sand Or Dye Casting |
Shrink cracks, Inclusion voids, Porosity, Cold shuts etc. |
Forge shop |
Billet Forging |
Burts, Laps, Cracks, Inclusions, Flash line cracks etc. |
Mill |
Extrusions |
Inclusions, Pipes, Seams, Laps, Die drag etc. |
Plate or Sheet |
Segregation, Laminations, Shearing separation of edges. |
Bar, Wire, Rod |
Inclusions, Pipes, Seams, Laps, Cracks. |
Tubing & Pipe |
Inclusions, Seams, Cracks. |
Assembly OR Finishing |
Welding |
Porosity, Voids, Cracks, Incomplete fusion, and Penetration. |
Grinding |
Cracks. |
Machining |
Tears, Cracks, Thickness variation. |
Heat Treating |
Cracks,Grain size or metallurgic variations, Surface oxidation etc. |
Plating, |
Cracks, Embrittlement, Peeling. |
Bonding(adhering, Braze, diffusion) |
Lack of bond, Voids, Cracks. |
Forming, Pickling |
Cracks, Folds, Stress cracks. |
In Service Cycle |
All Products |
Fatigue cracks, Overload cracks, Stress corrosion, Galling pits, Debends, Torsional overload etc. |
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